To modify the cliff jumping cam:
Rig a parachute that will allow the cam to drop slowly. Angle the camera down towards the water. Drop the camera, let it fall for a few seconds. Then start jumping past the camera, so it gets a shot of you mid air, the catches you hitting the water. Would be awesome if you could get a shot of 10 people jumping in a row.
Slow mo shots of shooting pumpkins at a range (if you are willing to risk your camera)